m6 tolerance (shaft, IT6)
Shaft tolerance class m6 per ISO 286-1:2010: fundamental deviation ei +2 … +23, grade IT6 (6 µm at ≤ 3 mm to 40 µm at 400–500 mm). For an exact size, open the calculator with m6 selected.
- Type
- Shaft
- Grade
- IT6
- Tolerance
- 6 … 40 µm
- Fund. deviation
- ei +2 … +23 µm
m6 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +8 | +2 | 3.008 | 3.002 | +0.008 | +0.002 | +0.00031 / +0.00008 |
| 3 – 6 | +12 | +4 | 6.012 | 6.004 | +0.012 | +0.004 | +0.00047 / +0.00016 |
| 6 – 10 | +15 | +6 | 10.015 | 10.006 | +0.015 | +0.006 | +0.00059 / +0.00024 |
| 10 – 14 | +18 | +7 | 14.018 | 14.007 | +0.018 | +0.007 | +0.00071 / +0.00028 |
| 14 – 18 | +18 | +7 | 18.018 | 18.007 | +0.018 | +0.007 | +0.00071 / +0.00028 |
| 18 – 24 | +21 | +8 | 24.021 | 24.008 | +0.021 | +0.008 | +0.00083 / +0.00031 |
| 24 – 30 | +21 | +8 | 30.021 | 30.008 | +0.021 | +0.008 | +0.00083 / +0.00031 |
| 30 – 40 | +25 | +9 | 40.025 | 40.009 | +0.025 | +0.009 | +0.00098 / +0.00035 |
| 40 – 50 | +25 | +9 | 50.025 | 50.009 | +0.025 | +0.009 | +0.00098 / +0.00035 |
| 50 – 65 | +30 | +11 | 65.030 | 65.011 | +0.030 | +0.011 | +0.00118 / +0.00043 |
| 65 – 80 | +30 | +11 | 80.030 | 80.011 | +0.030 | +0.011 | +0.00118 / +0.00043 |
| 80 – 100 | +35 | +13 | 100.035 | 100.013 | +0.035 | +0.013 | +0.00138 / +0.00051 |
| 100 – 120 | +35 | +13 | 120.035 | 120.013 | +0.035 | +0.013 | +0.00138 / +0.00051 |
| 120 – 140 | +40 | +15 | 140.040 | 140.015 | +0.040 | +0.015 | +0.00157 / +0.00059 |
| 140 – 160 | +40 | +15 | 160.040 | 160.015 | +0.040 | +0.015 | +0.00157 / +0.00059 |
| 160 – 180 | +40 | +15 | 180.040 | 180.015 | +0.040 | +0.015 | +0.00157 / +0.00059 |
| 180 – 200 | +46 | +17 | 200.046 | 200.017 | +0.046 | +0.017 | +0.00181 / +0.00067 |
| 200 – 225 | +46 | +17 | 225.046 | 225.017 | +0.046 | +0.017 | +0.00181 / +0.00067 |
| 225 – 250 | +46 | +17 | 250.046 | 250.017 | +0.046 | +0.017 | +0.00181 / +0.00067 |
| 250 – 280 | +52 | +20 | 280.052 | 280.020 | +0.052 | +0.020 | +0.00205 / +0.00079 |
| 280 – 315 | +52 | +20 | 315.052 | 315.020 | +0.052 | +0.020 | +0.00205 / +0.00079 |
| 315 – 355 | +57 | +21 | 355.057 | 355.021 | +0.057 | +0.021 | +0.00224 / +0.00083 |
| 355 – 400 | +57 | +21 | 400.057 | 400.021 | +0.057 | +0.021 | +0.00224 / +0.00083 |
| 400 – 450 | +63 | +23 | 450.063 | 450.023 | +0.063 | +0.023 | +0.00248 / +0.00091 |
| 450 – 500 | +63 | +23 | 500.063 | 500.023 | +0.063 | +0.023 | +0.00248 / +0.00091 |
Deviations at the upper end of each range (Ø columns use that size); use the calculator for the exact size. — : not defined by ISO 286 for that size. Upper/Lower (mm) and inch columns are shown on wider screens.
About m6
m6 denotes a shaft tolerance zone with tight transition deviation in the ISO 286 system. It is used in H7/m6 (Tighter than k6; parts that must not move under vibration but are still removable: bearing bushes, gears, couplings.).
At Ø25 mm m6 is +0.021 / +0.008 mm, i.e. 25.008 to 25.021 mm.
How the limits are calculated
m6 uses grade IT6 (a standard tolerance of 13 µm at 18–30 mm). Fundamental deviation: ei is tabulated directly by ISO 286-1 Table 2; es = ei + IT6. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.